I'd contend the national security issues are way way above my pay grade, as is safety on a scale larger than me separating airplanes. If the FAA decides in thier infinite wisdom to close facilites and thinks it's safe, that's not my problem. Anything that happens isn't your fault, not like you have input to say otherwise.
It's not like they are doing these overnight shutdowns at peak traffic time, and the space isn't being monitored.
I agree cleaning 5 days after the fact for a virus with a 24 hr lifespan outside the body (if I remember correctly) is kind of silly, but I'm glad they aren't doing nothing, as then you'd have more complaints on that, and I guarantee them doing nothing would absolutely bring media attention.